12. A heat-killed, phosphorescent (light-emitting) strain of bacteria is mixed with a living, non-phosphorescent strain. Further observations of themixture show that some of the living cells are now phosphorescent. Which of the following observations would provide the best evidence that theability to phosphoresce is a heritable trait?
(A) evidence that DNA was passed from the heat-killed strain to the living strain
(B) especially bright phosphorescence in the living strain
(C)evidence that protein passed from the heat-killed strain to the living strain
(D)phosphorescence in descendants of the living cells